1. Cook noodles according to package directions, omitting salt and fat. Add peas during last 1 minute of cooking. Drain; rinse with cold water.
2. Heat a large nonstick skillet over medium-high heat. Add peanut oil to pan; swirl to coat. Add tofu to pan; cook 5 minutes or until browned, stirring frequently.
3. Combine noodle mixture, tofu, tomatoes, water chestnuts, and onions in a large bowl. Combine vinegar and next 4 ingredients (through salt) in a small bowl, stirring with a whisk. Add vinegar mixture to noodle mixture, tossing gently to coat. Add 1 1/2 teaspoons sesame seeds; toss to combine. Sprinkle with remaining sesame seeds.
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